यदि $\sin A = \frac{1}{\sqrt{10}}$ और $\sin B = \frac{1}{\sqrt{5}}$ है,जहाँ $A$ और $B$ धनात्मक और न्यून कोण हैं,तो $A + B = $

  • A
    $\frac{\pi}{2}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{3}$
  • D
    इनमें से कोई नहीं

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$\frac{(\tan 69^{\circ} + \tan 66^{\circ})}{(1 - \tan 69^{\circ} \tan 66^{\circ})}$ का मान है

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$\cos 24^{\circ} + \cos 5^{\circ} + \cos 300^{\circ} + \cos 175^{\circ} + \cos 204^{\circ}$ का मान क्या है?

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